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[Music]
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hello interwebs welcome to let's fix
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computers i've got a macbook air here
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which does not power on we have
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no green light on the charger no orange
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light no light whatsoever so
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that means that we are missing some
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primary main super important power rails
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so let's take the bottom cover off and
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have a look so i'll buzz out the uh 10
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screws from the bottom
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there's an odd coating
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over this thing
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that looks like um a very fine vinyl
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wrap or something like that to cover up
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a load of scratches or something
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not sure why but if you're wondering why
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there's loads of weird-looking markings
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on it yeah that's what that is no idea
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why that's there
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oh that's interesting it's spray paint
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and i tell you how i know that because
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it's gone all up the inside
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how
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bizarre uh fine
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we're missing a screw from there as well
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it's been disassembled before because
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this screw is scratched up so
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okay
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uh
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let's see what do we have i'm just going
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to take off the
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bridge and just inspect that
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right i've unplugged the battery and
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plugged in the charger
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let's check for some basic voltages
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i'm guessing we're not going to have
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pp3v42
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because
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that powers the light on the charger
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um so we kind of need that
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that'll do right
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[Music]
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is pp3v42 on this side i don't think it
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is let's check for it over here
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19 volts in
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and there is pp3 v42
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at the source so that is there okay
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what about
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what about pps g3 hot we got that
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ah okay right pp bus g3 hard this tells
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us a bit more
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that is at
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that is at 8.2 volts
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uh which is wrong that should be 8.6
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what this tells me is that the smc is
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not running
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uh because
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pp bus g3 hot will run at 1.8
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or 8.18
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and then when the smc switch is on it
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bumps it up to 8.6
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so from this we can determine that the
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smc is not working and that is also why
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we don't have a light on the charger
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because the smc controls that light
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so what we'll do now is i'm going to
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take the logic board out of this thing
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and i'm going to see what we find on the
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other side of the board
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um i'm given that we've got just spray
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paint on this thing
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i'm concerned about what's on the other
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side of the board let's take it apart
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what
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all right so again we've got this line
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of silver along the back it hasn't
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strayed too far onto the logic board
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i don't think that's done any damage
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i don't think this is the cause of our
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problem
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at the very least
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i'm going to plug this back in just to
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check if there's been any change by
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removing the motherboard from the laptop
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there has not
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i might grab a different dc in board as
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well just to make sure i'm not getting
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punked by a bad dcn board
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because if this guy's not working
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properly
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um then that might be causing our issue
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and that might cause the smc not to turn
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on which means you have nothing
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so i'm going to swap out the dc board
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just in case
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all right different dc board
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bam
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yeah same thing okay
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fine
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why doesn't rsmc turn on
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so
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let's pull up a schematic for this
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and we'll just check some obvious things
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so this is a
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8200 165
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and if i zoom down to the corner here
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there's a section down here and this is
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smc reset
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and what this chip does is
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it tells this it tells the smc if it
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should turn on or not basically
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so it sends the on off signal the reset
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signal that kind of thing so what i want
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to know is is the smc being told to
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switch on
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uh or is it in a reset state
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is there some other reason why it's not
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turning on or is it just busted
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so i'll put my multimeter into voltage
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mode again
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and let's just see what i want to probe
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so firstly
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smc reset l is the first one i want to
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check
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so smc reset if a device is in reset it
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means it is resetting
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so a reset signal is a momentary signal
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it's like the reset button on your pc
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when you press it you momentarily
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contact that switch and then release it
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again while the switch is in while the
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button is in the computer is in a reset
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state and then when you release it it
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comes out of a recessed state and begins
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to boot up again
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so
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in this case smc reset underscore l the
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l means low so it means when this signal
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is low a la 0 we are in a reset state as
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if we're holding down the reset button
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so we want to see
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a signal here so i'll put my black probe
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on a screw hole for ground and i want to
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check pin five
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um
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it's going gonna be a little bit awkward
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to get in there let's see if we can
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probe that guy
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and there's
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1.2 volts there
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not sure if that's correct or not i was
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expecting um
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i was expecting
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a 3.3 volts
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what is powering this chip
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this chip is powered by pp3v42
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let's make sure that it's getting
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3.42 volts
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that might be correct you know might
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just be 1.2 is the high state
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i was just expecting 3.42 volts because
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that's normally a
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3.42 or 3.3
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is normally the true signal state for a
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macbook
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i believe anyway
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uh okay that's fine what about smc on
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offl what state is that in so that's pin
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seven
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the guy goes over to this big old pad
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here
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that is high
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okay where does smc reset come from
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it's got a pin over a j tag over here
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which got spray painted
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i can't believe that that's our issue
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i'm gonna look up the schematic for this
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to find out how smc reset is created
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because i'm not sure
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okay yeah that's confirmed um the u5110
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does create smc reset l
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and also this line it should be i was
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correct it should be at 3.40 volts
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because here we have a line pulling it
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up this is called a pull-up resistor so
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it's a 100k resistor and what this does
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is it's got pp3v42
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coming down onto this via this resistor
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so
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because this resistor connection is here
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in a normal condition smc reset l should
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be at
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3.42 volts
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and then when reese
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when we want to reset the smc
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this chip will pull this to ground
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now you might say well if that grounds
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it doesn't that create a short circuit
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it doesn't because of the resistor
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because there's a 100k resistor there
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when you short this to ground
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uh it cannot go short circuits there's
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100k of resistance to the power line so
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this goes to ground but the pull up line
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does not which is why it's not a short
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circuit
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so that's why when
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chips are sending signals to each other
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they can just short something to ground
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because the natural state is going
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through a pull-up resistor
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so this confirms that our reset should
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be at 3.42 volts
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so we need to find out why it's not
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because i think that's our problem
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um 1.2 volts it's not zero but that's
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probably low enough to be interpreted as
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a reset state so we need to find out why
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so what else is on that same smc
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reset line
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so we had the jtag connector
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and we've got
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a test point all the way up here
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is that even visible
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no it's not okay what's on the other
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side of the board
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then on the other side of the board
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there's a resistor over here going to
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what's that
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i can't remember what the u7100 is
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it looks like um charger management
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and then we've got the actual smc itself
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which is the new 5000
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so there's not a huge amount on here
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let's start with the simple one let's
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take u5110 off the board and see if smc
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reset goes high
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now we won't be able to turn on with
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this thing off the board because
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there'll be nothing to tell the smc to
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turn on but what we need to do is just
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see if that pull-up resistor then pulls
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up to 3.42 volts
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so let's see if i'm lucky and it's that
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simple
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because i was kind of hoping that there
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wouldn't be a lot more on that line but
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there's a couple of things and yeah
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right chip removed
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so
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i'm just going to give the board a
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second to cool down
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we have a green light on the charger
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and was that fan spin
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it shouldn't start
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yeah that's what i thought good okay
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i was gonna say we should be quite
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unable to turn on at the moment because
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the chip that tells the smc to turn on
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is not there
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however it looks like we have a culprit
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there we go so smc reset l is now up at
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three point well 3.38 so it's supposed
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to be 3.42 but probing and stuff like
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that that line should be 3.42 but
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because i'm trying to poke it with tiny
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little pro points and there's losses in
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the wires and all the rest of it you'll
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never see exactly the right voltage but
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that's clearly supposed to be 3.42
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um fine so u-5110 is dead um and that
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seems to be
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partially shorted to ground it's not a
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full short to ground
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however it was certainly dying enough
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that it was half pulling down that that
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line
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so theoretically if i can find another
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one
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we can just stick another one on the
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00:13:26,240 --> 00:13:30,079
board and we're laughing so i'm going to
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check my breaker boards and see what
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00:13:30,079 --> 00:13:34,000
i've got
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this board's a bit grubby around that
286
00:13:34,000 --> 00:13:37,680
area however i had no reason to believe
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00:13:36,240 --> 00:13:40,160
that this one doesn't work we'll soon
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00:13:37,680 --> 00:13:40,160
find out
289
00:13:40,320 --> 00:13:44,240
no that's really not coming clean fine
290
00:13:42,079 --> 00:13:48,639
whatever
291
00:13:44,240 --> 00:13:52,279
hot air and flux will boil it all clean
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purity is coming
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[Applause]
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ah
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00:14:12,079 --> 00:14:16,160
that came off discern concerningly
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00:14:13,920 --> 00:14:19,040
easily
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and for orientation the dot is in the
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bottom right of the chip
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and that is pin one
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00:14:23,680 --> 00:14:26,800
so i'll just put that on the board there
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00:14:25,279 --> 00:14:29,199
for a sec
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00:14:26,800 --> 00:14:34,240
and if i check the schematic we'll find
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00:14:29,199 --> 00:14:34,240
pin one is indeed in the bottom right
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00:14:34,480 --> 00:14:38,639
and we'll just touch up these solder
305
00:14:36,240 --> 00:14:41,360
joins before we put this back on just so
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00:14:38,639 --> 00:14:42,959
we get a decent connection
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00:14:41,360 --> 00:14:44,720
part me is very tempted just to put the
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00:14:42,959 --> 00:14:47,199
same chip back on the board just for
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00:14:44,720 --> 00:14:47,199
testing
310
00:14:47,600 --> 00:14:51,600
i might do that because it's not
311
00:14:49,680 --> 00:14:54,000
uncommon to have just a chip that's just
312
00:14:51,600 --> 00:14:55,920
developed a cracked solder joint or a
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00:14:54,000 --> 00:14:57,279
dry joint
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00:14:55,920 --> 00:14:58,959
and
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00:14:57,279 --> 00:15:00,560
it's interesting to test for that
316
00:14:58,959 --> 00:15:02,639
because sometimes you don't actually
317
00:15:00,560 --> 00:15:05,760
have to replace the part and if you just
318
00:15:02,639 --> 00:15:07,279
happen to not have a spare
319
00:15:05,760 --> 00:15:09,360
then that's suddenly going to be very
320
00:15:07,279 --> 00:15:11,519
interesting
321
00:15:09,360 --> 00:15:16,600
so i'll actually put the old one back on
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first just for the sake of testing
323
00:16:04,079 --> 00:16:08,800
all right that goes back on let's just
324
00:16:05,600 --> 00:16:10,959
see what happens now
325
00:16:08,800 --> 00:16:13,120
if you've got replacements then i would
326
00:16:10,959 --> 00:16:15,199
recommend using them anyway i think
327
00:16:13,120 --> 00:16:17,040
just in case you've got an intermittent
328
00:16:15,199 --> 00:16:18,639
part but
329
00:16:17,040 --> 00:16:20,079
i'm interested in doing this for testing
330
00:16:18,639 --> 00:16:23,079
we have a green light and we have fan
331
00:16:20,079 --> 00:16:23,079
spin
332
00:16:23,920 --> 00:16:28,720
and the fan continues to spin because
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00:16:25,519 --> 00:16:28,720
we've actually switched on now
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00:16:29,680 --> 00:16:34,600
there you go folks didn't even need the
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00:16:31,600 --> 00:16:34,600
spare
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good stuff
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00:16:38,480 --> 00:16:42,240
all right well i'm going to put the old
338
00:16:40,320 --> 00:16:44,880
one back on my donor board then just so
339
00:16:42,240 --> 00:16:44,880
it's still there
340
00:16:45,600 --> 00:16:49,880
and then we'll put this back together
341
00:16:46,880 --> 00:16:49,880
again
342
00:16:50,000 --> 00:16:56,160
so this one turned out to be easier than
343
00:16:51,839 --> 00:16:58,320
it looked however cracking example of um
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00:16:56,160 --> 00:16:59,759
of smc reset l
345
00:16:58,320 --> 00:17:03,720
in action
346
00:16:59,759 --> 00:17:03,720
or rather not in action
347
00:17:04,559 --> 00:17:10,319
and also a great example that
348
00:17:07,679 --> 00:17:13,280
you might not need to replace the bit
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00:17:10,319 --> 00:17:13,280
that you've taken off
350
00:17:13,520 --> 00:17:17,039
as i say that's not necessarily the
351
00:17:15,280 --> 00:17:19,120
recommended action
352
00:17:17,039 --> 00:17:21,760
but i know certainly for people who are
353
00:17:19,120 --> 00:17:24,240
starting out in board repair
354
00:17:21,760 --> 00:17:26,400
you probably don't have a load of
355
00:17:24,240 --> 00:17:27,839
breaker boards lying around
356
00:17:26,400 --> 00:17:30,480
and
357
00:17:27,839 --> 00:17:33,679
when you don't have heck i need some
358
00:17:30,480 --> 00:17:34,799
flux on here i was trying to be lazy
359
00:17:33,679 --> 00:17:36,960
there we go
360
00:17:34,799 --> 00:17:39,039
when you don't have um all the spare
361
00:17:36,960 --> 00:17:40,720
bits lying around suddenly very simple
362
00:17:39,039 --> 00:17:41,919
problems can be very difficult to deal
363
00:17:40,720 --> 00:17:44,480
with because
364
00:17:41,919 --> 00:17:46,480
you've got to spend three weeks waiting
365
00:17:44,480 --> 00:17:49,600
for a bit to show up from china every
366
00:17:46,480 --> 00:17:49,600
time you make a move
367
00:17:50,799 --> 00:17:56,679
which is a hecking pain in the ass
368
00:17:52,960 --> 00:17:56,679
ask me how i know
369
00:18:01,120 --> 00:18:05,600
all right i don't need this to be on
370
00:18:02,240 --> 00:18:05,600
properly i just need it to be on
371
00:18:10,559 --> 00:18:14,720
that should do
372
00:18:13,120 --> 00:18:17,200
as long as it doesn't long as it doesn't
373
00:18:14,720 --> 00:18:17,200
fall off
374
00:18:18,160 --> 00:18:20,880
there we go good
375
00:18:27,120 --> 00:18:31,520
so i wonder if that was the um
376
00:18:29,440 --> 00:18:33,679
uh the spray paint that's eaten away at
377
00:18:31,520 --> 00:18:33,679
that
378
00:18:34,240 --> 00:18:38,400
or whether that's just a coincidence
379
00:18:36,559 --> 00:18:40,080
either way don't spray paint your
380
00:18:38,400 --> 00:18:42,400
laptops
381
00:18:40,080 --> 00:18:44,160
in this manner
382
00:18:42,400 --> 00:18:45,840
if you're going to spray paint something
383
00:18:44,160 --> 00:18:47,520
actually take it apart and strip it down
384
00:18:45,840 --> 00:18:50,000
first
385
00:18:47,520 --> 00:18:53,960
and this doesn't happen
386
00:18:50,000 --> 00:18:53,960
what a bizarro issue
387
00:18:57,440 --> 00:19:03,440
there we go that looks fine to me
388
00:19:00,240 --> 00:19:03,440
let's put it back in the laptop
389
00:19:04,400 --> 00:19:08,240
reassembly is the worst bit because this
390
00:19:06,480 --> 00:19:09,919
is the point where you're just like i've
391
00:19:08,240 --> 00:19:12,720
won i've done it can i go and do
392
00:19:09,919 --> 00:19:12,720
something else now
393
00:19:13,360 --> 00:19:17,360
actually i'll rephrase that the worst
394
00:19:15,280 --> 00:19:18,799
bit isn't risk the worst bit is
395
00:19:17,360 --> 00:19:21,679
reassembly
396
00:19:18,799 --> 00:19:22,720
after you've given up
397
00:19:21,679 --> 00:19:24,480
because
398
00:19:22,720 --> 00:19:25,520
you have to put the laptop back together
399
00:19:24,480 --> 00:19:29,679
again because you can't just give it
400
00:19:25,520 --> 00:19:31,679
back to the customer in a pile of pieces
401
00:19:29,679 --> 00:19:34,080
but at the same time it feels like such
402
00:19:31,679 --> 00:19:37,080
a waste of time to reassemble a dead
403
00:19:34,080 --> 00:19:37,080
laptop
404
00:19:41,520 --> 00:19:45,440
i try to reassemble using the minimum
405
00:19:43,520 --> 00:19:47,039
amount of screws
406
00:19:45,440 --> 00:19:49,120
just in case i have to take it apart
407
00:19:47,039 --> 00:19:50,640
again but by the time you've actually
408
00:19:49,120 --> 00:19:52,400
gone to the trouble of
409
00:19:50,640 --> 00:19:54,799
connecting everything up and plugging it
410
00:19:52,400 --> 00:19:56,799
all in for a fair test
411
00:19:54,799 --> 00:19:59,600
you may as well just put in the last
412
00:19:56,799 --> 00:19:59,600
couple of screws
413
00:19:59,919 --> 00:20:04,840
especially considering this is missing a
414
00:20:01,520 --> 00:20:04,840
couple anyway
415
00:20:07,679 --> 00:20:12,159
so we're going
416
00:20:08,960 --> 00:20:12,159
no guts no glory now
417
00:20:15,039 --> 00:20:20,280
let's have a battery as well because why
418
00:20:16,720 --> 00:20:20,280
the hell not
419
00:20:25,200 --> 00:20:29,760
speaker right
420
00:20:27,919 --> 00:20:31,520
remember folks don't look at what's in
421
00:20:29,760 --> 00:20:33,679
the laptop look at what is left on your
422
00:20:31,520 --> 00:20:36,400
bench and the only thing as i have left
423
00:20:33,679 --> 00:20:39,520
on my bench are the case screws and the
424
00:20:36,400 --> 00:20:42,000
spare dc inboard that i was testing with
425
00:20:39,520 --> 00:20:42,000
all right
426
00:20:43,440 --> 00:20:46,080
because if there's nothing left on your
427
00:20:44,720 --> 00:20:49,799
bench then you must have put it all in
428
00:20:46,080 --> 00:20:49,799
the laptop right
429
00:20:53,919 --> 00:20:57,200
bam green light
430
00:20:58,320 --> 00:21:01,320
charge
431
00:21:03,039 --> 00:21:06,080
and chime
432
00:21:08,159 --> 00:21:12,240
huh
433
00:21:09,280 --> 00:21:12,240
and get power cycled
434
00:21:12,960 --> 00:21:16,360
there it goes
435
00:21:17,760 --> 00:21:20,159
right
436
00:21:22,240 --> 00:21:25,919
lovely
437
00:21:23,840 --> 00:21:27,039
we have a working laptop everyone
438
00:21:25,919 --> 00:21:30,039
there we go
439
00:21:27,039 --> 00:21:31,919
so a bad connection under
440
00:21:30,039 --> 00:21:35,760
u5110
441
00:21:31,919 --> 00:21:37,600
was causing the smc to be stuck in reset
442
00:21:35,760 --> 00:21:39,360
mode which was preventing the laptop
443
00:21:37,600 --> 00:21:42,480
from turning on
444
00:21:39,360 --> 00:21:44,799
and reflowing the reflowing the solder
445
00:21:42,480 --> 00:21:45,679
joins on that chip seems to resolve the
446
00:21:44,799 --> 00:21:47,120
issue
447
00:21:45,679 --> 00:21:48,559
i'm going to leave this to one side just
448
00:21:47,120 --> 00:21:50,159
to make sure it doesn't cut out and then
449
00:21:48,559 --> 00:21:52,000
i'll give it some reboots and stuff like
450
00:21:50,159 --> 00:21:53,600
that and assuming that there's no
451
00:21:52,000 --> 00:21:55,280
problems there it goes back to the
452
00:21:53,600 --> 00:21:57,039
customer thank you very much for
453
00:21:55,280 --> 00:21:58,320
watching everyone as always my support
454
00:21:57,039 --> 00:22:01,520
links are in the description down below
455
00:21:58,320 --> 00:22:04,080
for my patreon discord twitter instagram
456
00:22:01,520 --> 00:22:05,840
and if you enjoyed the video hit the uh
457
00:22:04,080 --> 00:22:07,280
the like button because that helps me
458
00:22:05,840 --> 00:22:08,799
out and it tells youtube that this is
459
00:22:07,280 --> 00:22:10,480
the kind of content that you want to see
460
00:22:08,799 --> 00:22:11,679
so youtube will send you more of these
461
00:22:10,480 --> 00:22:16,200
videos
462
00:22:11,679 --> 00:22:16,200
thank you and see you next time bye
463
00:22:29,200 --> 00:22:31,280
you31275
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